Alpine SBR-S8D4.2 R-Series 8” Compact Subwoofer in Tuned enclosure


The Alpine SBR-S8-4 8” Enclosed Subwoofer lets you add deep, accurate bass to your sound system without taking up much space in your vehicle.




Alpine SBR-S8D4.2

R-Series 8” Compact Subwoofer in Tuned enclosure

Loud, Clean Bass That Fits Anywhere

The Alpine SBR-S8D4 features Alpine’s Type-R 8″ subwoofer in a custom slot ported enclosure. Ideal for installation in small spaces, its compact size means it can fit virtually anywhere.

The pre-installed subwoofer employs many features typically found in larger models, such as Alpine’s H.A.M.R (High Amplitude Multi-Roll) suspension. This unique design allows greater linear excursion while improving control, to achieve maximum output and outstanding sound quality.

Designed to achieve optimal output, the carpeted enclosure features heavy-duty MDF construction. Plus, stylish brushed aluminium laminate and a robust grill create the perfect balance of stunning aesthetics and practicality.

Alpine’s new 2nd generation R-Series Subwoofers feature enhanced sound performance in an exciting new aesthetic. A larger motor structure featuring double-stacked neodymium magnets and an integrated faraday-ring results in a deeper, clearer and tighter bass while the all-new Kevlar-treated cone ensures this extra performance is reliable – even at higher volumes.

The new EZ-Change twist-lock grille mounting system makes subwoofer installation easier than ever before. The optional grille (KTE-12G), exudes a tough look with the benefit of added protection.

Quality and Performance unrivalled in the industry, Alpine’s new 2nd Generation R-Series continues to be the benchmark in sound quality for the audio enthusiast.


  • 900W Peak Power
  • 300W RMS Power
  • High Amplitude Multi-Roll (HAMR) surround
  • Frequency Response: 28Hz – 400Hz
  • USA Designed Slot Ported Subwoofer Enclosure
  • Heavy Gauge Spring Terminals
  • Dimensions: (L x W x H cm) 49 x 29 x 16
  • SWR-823D Pre-installed
  • Grille Included
  • Power Handling (RMS/Peak)
    • 350W/1000W
  • Power Range (RMS)
    • 150W-350W
  • Frequency Response (Hz)
    • 28Hz-200Hz
  • Diaphragm Material
    • Kevlar-reinforced Pulp Fiber
  • Diaphragm Design
    • 2-piece structural parabolic
  • Surround Material
    • Injection moulded Santoprene
  • Surround Design
    • High Amplitude Multi-Roll (Patent Pending)
  • Spider Material
    • Nomex
  • Spider Design
    • Progressive
  • Voice Coil Material
    • 180˚C High Temp Wire on Spiral Cut Aluminium Former
  • Voice Coil Design
    • 4-Layer Dual Voice Coil
  • Motor Structure Pole Geometry
    • Compound Radius Curve
  • Motor Structure Configuration
    • Integration Shorting Sleeve with Radial Vented VC Heat Transfer
  • Magnet Material
    • High-Power Strontium Ferrite
  • Magnet Configuration
    • 6-Piece (8″) / 10-Piece (10″/12″) Radially Segmented, Double Stacked
  • Frame Material
    • Cast Aluminium
  • Frame Design
    • Single-Piece Casting with Airflow Management System
  • Terminals Layout
    • One-sided
  • Terminals Design
    • Heavy Duty 8ga, Push with housing, Banana Sockets for VC Configuration Jumpers
  • Tinsel Leads Design
    • Reinforced Layer Spider Integration
  • Gasket Design
    • Concealed Mount Gasket System and Integrated Grill Ready



  • Nominal Impedance
    • 2ohms+2ohms
  • Frequency Response
    • 28-200Hz
  • Sensitivity (SPL @ 1W/1m)
    • 83.5dB
  • D.C Coil Resistance (Re)
    • 1.85ohms +1.85ohms
  • Inductance (Le) 1kHz/20kHz
    • 0.87mH/0.30mH
  • Free Air Resonance (Fs)
    • 38Hz
  • Equivalent Stiffness (Vas)
    • 12L (0.42 ft³)
  • Mechanical Q (Qms)
    • 7.8
  • Electrical Q (Qes)
    • 0.55
  • Total Q (Qts)
    • 0.50
  • Xmax10 (One-Way Xmax @ 10% Distortion)
    • 314mm
  • Mechanical Excursion, Peak-to-Peak
    • 52mm
  • Gap Height (Hag)
    • 10mm
  • Coil Height (Hvc)
    • 29mm
  • Cone Area (Sd)
    • 201 cm²
  • Voice Coil Diameter
    • 40mm (1.6″)
  • Magnet Weight
    • 52oz


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